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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Schedule of Held-to-maturity Securities [Line Items] |  |
Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale | Below is an analysis of the amortized cost and estimated fair values of securities available for sale at:
| September 30, 2020 |  | December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (dollars in thousands)
Obligations of U.S. Government Agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | $ | 6,778 |  |  | $ | 763 |  |  | $ | — |  |  | $ | 7,541 |  |  | $ | 7,745 |  |  | $ | 596 |  |  | $ | — |  |  | $ | 8,341 |
Mortgage-Backed Securities – Commercial | 209,175 |  |  | 9,377 |  |  | — |  |  | 218,552 |  |  | 186,316 |  |  | 2,983 |  |  | (166) |  |  | 189,133 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 527,570 |  |  | 15,977 |  |  | (4) |  |  | 543,543 |  |  | 660,777 |  |  | 4,113 |  |  | (2,943) |  |  | 661,947 |
Other Government-Sponsored Enterprises | 100,993 |  |  | 2 |  |  | (2) |  |  | 100,993 |  |  | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
Obligations of States and Political Subdivisions | 12,965 |  |  | 208 |  |  | (6) |  |  | 13,167 |  |  | 17,738 |  |  | 171 |  |  | — |  |  | 17,909 |
Corporate Securities | 22,935 |  |  | 1,505 |  |  | — |  |  | 24,440 |  |  | 22,919 |  |  | 1,043 |  |  | — |  |  | 23,962 |
Total Securities Available for Sale | $ | 880,416 |  |  | $ | 27,832 |  |  | $ | (12) |  |  | $ | 908,236 |  |  | $ | 896,495 |  |  | $ | 8,906 |  |  | $ | (3,109) |  |  | $ | 902,292 |
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale | The amortized cost and estimated fair value of debt securities available for sale at September 30, 2020, by contractual maturity, are shown below.
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 104,991 |  |  | $ | 105,041 |
Due after 1 but within 5 years | 20,225 |  |  | 21,260 |
Due after 5 but within 10 years | 7,127 |  |  | 7,749 |
Due after 10 years | 4,550 |  |  | 4,550 |
| 136,893 |  |  | 138,600 |
Mortgage-Backed Securities (a) | 743,523 |  |  | 769,636 |
Total Debt Securities | $ | 880,416 |  |  | $ | 908,236 |
(a)Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $216.0 million and a fair value of $226.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $527.6 million and a fair value of $543.5 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac | [1]
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale | Proceeds from sales, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the nine months ended September 30:
| 2020 |  | 2019
| (dollars in thousands)
Proceeds from sales | $ | — |  |  | $ | — |
Gross gains (losses) realized: |  |  |
Sales transactions: |  |  |
Gross gains | $ | — |  |  | $ | — |
Gross losses | — |  |  | — |
| — |  |  | — |
Maturities |  |  |
Gross gains | 47 |  |  | 15 |
Gross losses | — |  |  | — |
| 47 |  |  | 15 |
Net gains and impairment | $ | 47 |  |  | $ | 15 |
[1] | Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $44.3 million and a fair value of $46.0 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $181.4 million and a fair value of $187.4 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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